JP2009264660A - Refrigerator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a refrigerator capable of preventing not only the temperature of a machine chamber but also the temperature of the outer shell of a refrigerator from excessively rising when a machine chamber fan abnormally stops. <P>SOLUTION: This refrigerator includes a compressor 11 in the machine chamber 10, and has the machine chamber fan 20 installed therein for air-cooling a machine in the machine chamber 10. The refrigerator includes a control device 21 for detecting abnormal stopping of the machine chamber fan 20 and preventing the temperatures of the machine chamber and the outer shell of the refrigerator from becoming high by stopping the compressor 11, and a fan abnormality display 23 for displaying abnormality of the machine chamber fan 20 when the compressor 11 is stopped. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a refrigerator.

  In the machine room of the refrigerator, although it is a narrow space, machines that generate heat during operation, such as a compressor and a condenser, are installed. For this reason, a fan is installed in this machine room in order to cool the machines that generate heat. Although such a machine room fan may also stop due to a failure, if the compressor operation is continued in the stopped state, the temperature of the compressor rises, the temperature of the refrigerant inside rises, and enters the outer shell of the refrigerator. The stretched refrigerant piping also rises excessively, and the refrigerator outer shell may become hot particularly in an environment where the outside air temperature is high.

Conventionally, in this type of refrigerator, when a machine room fan fails or is locked and stopped, as described in Japanese Patent Application Laid-Open No. 2003-121032 (Patent Document 1), the decay of food in the refrigerator In order to prioritize the prevention of the compressor, the compressor that is necessary for the original refrigerator cooling is switched to a low speed to continue the operation, and the technology to control the operation of the compressor overload relay is known. . However, in the case of such a conventional refrigerator, since the compressor is switched to a low speed operation due to a failure of the machine room fan without considering the outside air temperature, the outside air temperature is relatively low, so that the normal operation of the compressor is performed. Even if the operation is continued, the refrigerant temperature is not increased excessively, so that the vehicle is operated at a low speed, and the refrigeration efficiency is deteriorated.
JP 2003-121032 A

  The present invention has been made in view of the problems of the prior art, and when the machine room fan abnormally stops, not only the temperature of the machine room and the compressor in the machine room but also the temperature of the refrigerator outer shell is excessive. It aims at providing the refrigerator which can prevent becoming high temperature.

  One feature of the present invention is that a refrigerator having a compressor in a machine room and provided with a machine room fan for air-cooling the machine in the machine room measures an outside air temperature around the refrigerator. A sensor, a fan abnormality monitoring means for detecting an abnormal stop of the machine room fan, the fan abnormality monitoring means detects an abnormal stop of the machine room fan, and the outside air temperature measured by the outside air temperature sensor is a predetermined value. Compressor control means for controlling the compressor to stop when the temperature is higher than the temperature, and fan abnormality display means for displaying an abnormality of the machine room fan when the compressor is stopped by the compressor control means; It is a refrigerator provided with.

  Another feature of the present invention is that a machine room is provided with an inverter-controlled compressor, and a machine room fan is installed to cool the machine in the machine room, and the ambient temperature around the refrigerator is measured. An outside air temperature sensor, fan abnormality monitoring means for detecting an abnormal stop of the machine room fan, the fan abnormality monitoring means detecting an abnormal stop of the machine room fan, and the outside air temperature measured by the outside air temperature sensor When the temperature is higher than a predetermined value, compressor control means for controlling the compressor to decelerate at a lower speed than the normal operation speed, and the compressor is decelerated by the compressor control means. And a fan abnormality display means for displaying an abnormality of the fan in the machine room.

  According to still another aspect of the present invention, there is provided a refrigerator including a compressor operating at a constant speed in a machine room and provided with a machine room fan for air-cooling the machine in the machine room. An outside temperature sensor that measures the abnormal stop of the machine room fan, a fan abnormality monitoring unit that detects an abnormal stop of the machine room fan, the fan abnormality monitoring unit detects an abnormal stop of the machine room fan, and the outside temperature sensor measures When the outside air temperature is higher than a predetermined value, compressor control means for controlling the compressor to be intermittently operated for a time shorter than normal operation time, and the compressor is intermittently connected by the compressor control means. It is a refrigerator provided with fan abnormality display means for displaying abnormality of a machine room fan when being operated.

  According to the refrigerator of the present invention, when the machine room fan is abnormally stopped, if the outside air temperature is higher than a predetermined value, the abnormality of the machine room fan is displayed to the outside and the compressor is stopped, or the low speed operation or the intermittent operation is performed. Therefore, even if the fan in the machine room stops, the temperature of the machine room does not rise due to the heat generated by the compressor, and as a result, the refrigerant is prevented from becoming hot, and the refrigerant pipe around the outer shell of the refrigerator It can prevent that the surface of a refrigerator becomes too high temperature with a refrigerant | coolant.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[First Embodiment]
As shown in FIG. 1, the main body of the refrigerator 1 is formed of a heat insulating box 2, and an internal storage chamber is partitioned into a refrigerator compartment 4 and a freezer compartment 6.

  A refrigeration evaporator (hereinafter referred to as “R EVA”) 7 and a cooling fan (hereinafter referred to as “R fan”) 8 are disposed on the back of the refrigerator compartment 4, and a freezer is provided on the back of the freezer compartment 6. An evaporator (hereinafter referred to as “F EVA”) 14 and a cooling fan (hereinafter referred to as “F fan”) 13 are arranged. A machine room 10 is provided by forming a space in the lower back of the freezer compartment 6. The machine room 10 is provided with a compressor 11, a heat radiating pipe 25, a three-way valve 15 and the like as will be described later.

  As shown in FIG. 2, in the refrigeration cycle, a compressor 11 that discharges refrigerant and a condenser 12 are sequentially connected, and a refrigeration capillary tube 16 and an F EVA 14 are connected in series by a three-way valve 15 at the subsequent stage. And a pipe connecting the refrigerated capillary tube 17 and the R EVA 7 are connected in parallel, and joined and connected on the suction side of the compressor 11. Further, a check valve 18 is connected between the outlet of the F evaporator 14 and the suction side of the compressor 11.

  The three-way valve 15 allows the refrigerant to flow to the R and F EVAs 14 and 14 to be fully opened to open the flow path to both the R and F EVAs, and to open only the R and 7 sides. It is possible to switch to four modes of R flow that closes the 14 side, F flow that opens only the F EVA 14 side and closes the R EVA 7, and a fully closed mode that closes both flow paths.

  In this refrigeration cycle, when the internal temperature of both the refrigerator compartment 4 and the freezer compartment 6 is equal to or higher than a predetermined temperature, such as when the refrigerator is started, the three-way valve 15 is fully opened, and the refrigerant discharged from the compressor 11 is condensed into the condenser. From 12 to the three-way valve 15, the refrigerant is circulated through the capillary tubes 16 and 17, evaporated by both the R and F evaporators 14 and 14, respectively, and the refrigerant is returned from the accumulator to the compressor 11 through the suction pipe. The cold air generated in both the R and F EVAs 14 and 14 is blown out into the respective rooms by the R fan 8 and the F fan 13 to cool the stored items.

  When the freezing chamber 6 is cooled to the set temperature by the cooling action and the temperature of the refrigerating chamber 4 has not yet decreased to the set temperature, the three-way valve 15 is switched to R flow, and the refrigerant flows from the three-way valve 15 to the R EVA 7 side. Only introduced. The cold air is introduced into the refrigerator compartment 4 by the operation of the R fan 8 and cools it.

  When only the freezer compartment 6 is equal to or higher than the set temperature, the three-way valve 15 is F-flowed, and the refrigerant discharged from the compressor 11 evaporates from the condenser 12 and the capillary tube 16 by the F evaporator 14 and passes through the accumulator. The cool air that has been returned to the compressor 11 and generated by the F-evaporator 14 is supplied to the freezer compartment 6 by the F-fan 13 to cool it.

  When the refrigerator compartment 4 and the freezer compartment 6 are each cooled to a predetermined temperature, a temperature sensor installed at an appropriate location in the warehouse detects this, and the three-way valve 15 is switched to cool alternately, or the compressor 11 and cooling fans 8 and 13 are controlled to be stopped. These are controlled by the control device 21.

  The configuration of the machine room 10 will be described with reference to FIG. In the machine room 10, many refrigeration cycle parts and piping such as a connecting pipe to the compressor 11 and the condenser 12 arranged on the bottom surface of the main body, the three-way valve 15, the capillary tubes 16 and 17, and the heat radiation pipe 25 are arranged. It is. A machine room fan (hereinafter referred to as “C fan”) 20 for taking outside air into the machine room 10 and air-cooling heat generating members such as the compressor 11 and the heat radiating pipe 25 is provided in the machine room 10. It is installed. The C fan 20 is also controlled by the control device 21.

  The heat radiating pipe 25 comes out of the condenser 12 in order to increase the heat radiating area, passes through the top and back portions of the outer shell of the refrigerator 1 (not shown), and then returns to the machine room 10 to be connected to the three-way valve 15. It is in piping.

  For example, when the installation location of the refrigerator 1 is in a high-temperature atmosphere or in a high-temperature atmosphere in summer, and the heat radiation conditions are bad, the compressor 11 is not radiated due to a failure of the C fan 20 or the like and is operated in a high-temperature state. If it continues, the temperature in the machine room 10 will become high too much, and the temperature of the outer shell of the refrigerator 1 may also become high temperature too much.

  FIG. 4 shows a block diagram of the control function of the control device 21 in the refrigerator of the present embodiment, and FIG. 5 controls the compressor 11 when the C fan 20 stops abnormally and the outer shell of the refrigerator 1 becomes excessively hot. The flowchart of the control function which prevents becoming is shown.

  An outside air temperature sensor 22 for measuring the outside air temperature is installed at an appropriate place of the refrigerator 1, for example, the back surface, ceiling surface, or side surface of the machine room 10, and the outside air temperature measurement value is input to the control device 21. . Further, a display 23 is installed at an appropriate position of the door of the refrigerator compartment 4 together with an operation panel for adjusting the temperature, and display information output from the control device 21 is displayed. Further, the control device 21 inputs an operation signal of the power switch 24 of the refrigerator 1, controls the start / stop of the compressor 11, controls the start / stop of the C fan 20 in the machine room 10, and this C fan 20. The operation is monitored and an abnormal stop is detected.

  The control operation of the compressor 11 when the C fan 20 is abnormally stopped by the control device 21 is as follows.

  The control device 21 starts the compressor 11 when the power is turned on, starts the C fan 20, and monitors the operation of the C fan 20 (steps S1 and S2). If no abnormality occurs in C fan 20, normal operation is continued (branch to NO in step S3).

  If the C fan 20 stops abnormally, the control device 21 repeats the restart of the C fan 20 up to a preset number N (for example, 3 times) (steps S3 to S5). The repetition time interval is preferably, for example, once every 5 minutes, once every 20 minutes, and once every hour. If the C fan 20 is actually restarted by the restart control up to N times, it is determined that the C fan 20 is not in failure and returns to normal operation (branch to NO in step S5 and branch to NO in step S3). ).

  However, if the C fan 20 does not actually restart after N restart attempts, the outside air temperature measured by the outside air temperature sensor 22 is more than the predetermined values Tref1 (= 31 ° C.) and Tref 2 (= 33 ° C.). (Step S5 branches to YES and proceeds to step S6). This temperature condition is illustrative and not limited.

  In this step S6, if the outside air temperature is higher than the predetermined value Tref2, if the compressor 11 is continuously operated, the inside of the machine room 10 becomes hot and the outer shell of the refrigerator 1 becomes too hot. In order to prevent this, the operation of the compressor 11 is stopped (steps S6 and S7). Then, the abnormality of the C fan 20 is displayed on the display 23 (step S8). On the other hand, even if the C fan 20 stops abnormally and does not actually restart after N restart attempts, if the outside air temperature is lower than Tref1, the operation of the compressor 11 is continued. The food is continued to be cooled (steps S6 and S9). However, since there is no doubt that an abnormality has occurred in the C fan 20 in this case, the abnormality of the C fan 20 is displayed on the display 23 (step S10). In addition, even when the outside air temperature is lowered even after the outside air temperature is high and the compressor 11 is stopped, if the outside air temperature becomes lower than Tref1, the compressor 11 is restarted and the cooling operation is resumed.

  If the user turns off the power after seeing the abnormality notification of the C fan 20 on the display 23, if this operation is a normal on / off operation, it is regarded as a user's power-on operation, and the refrigerator 1 is operated. Is restarted (branch to NO in steps S11 and S12).

  Even if the user restarts the operation of the refrigerator 1 several times to recover the abnormality, if the abnormality of the C fan 20 does not recover, a repair request is made to the manufacturer. Therefore, when a repair engineer is called and the refrigerator 1 is inspected and repaired, it is determined by a special operation of the power switch 24 that has been set in advance that the person is a repairer, and a transition is made to the inspection / repair mode (step). S11, S12, S13).

  Thereby, according to the refrigerator 1 of this Embodiment, even if C fan 20 stops abnormally once, control device 21 judges whether C fan 20 really broke down by trying N times of restarts. Since the normal operation is continued if the C fan 20 can be restarted within N restart attempts, the abnormality of the C fan 20 can be reliably determined.

  Then, the control device 21 considers that the C fan 20 is really out of order if the C fan 20 cannot be restarted even after N restart attempts. Then, the control device 21 refers to the outside air temperature in this case, and if the compressor 11 is continuously operated with the C fan 20 stopped depending on whether or not the outside air temperature is higher than the predetermined temperature, the outside of the refrigerator 1 It can be determined whether or not the shell is in an environment that tends to become excessively hot, and the compressor 11 is stopped if the shell is in a high-temperature environment, thereby preventing the outer shell of the refrigerator 1 from becoming excessively hot. it can.

  In the present embodiment, the abnormal stop of the C fan 20 is confirmed by N restart attempts, but this is a technique that is adopted as necessary for the purpose of simplifying the control. It is also possible to determine that the stop is abnormal by detecting the stop once.

  Further, the outside air temperature sensor 22 stops the compressor 11 when the outside air temperature is higher than the predetermined temperature. However, the present invention is not limited to this, and the compressor 11 can be turned off if an abnormal stop of the C fan 20 is detected. A simple control for stopping can also be adopted.

[Second Embodiment]
The refrigerator of the 2nd Embodiment of this invention is demonstrated using FIG. 4, FIG. The structure of the refrigerator 1 in the present embodiment is the same as that of the first embodiment, and is shown in FIGS. Therefore, in the following description, elements common to the first embodiment will be described using common reference numerals.

  The feature of the present embodiment lies in the control of the compressor 11 when the C fan 20 is abnormally stopped performed by the control device 21, and the control device 21 rotates the compressor 11 at a low speed when the C fan 20 stops abnormally. The cycle operation is continued as much as possible, and if the C fan 20 does not restart after N restart attempts, it is regarded as an abnormal failure, the compressor 11 is stopped according to the outside temperature, and the operation of the refrigeration cycle is performed. Control to abort.

  The functional configuration of the control device 21 is shown in FIG. 4 as in the first embodiment. And the control flow of the control apparatus 21 is what was shown in FIG. In the following, the control of continuing the operation with the compressor 11 rotating at a low speed means that if the compressor 11 is controlled by the inverter, the operation is performed with the frequency lowered to a preset minimum frequency, In the case where the compressor 11 is operated at a constant speed, in the following description, it means that the rotation of the compressor 11 is switched to a control that operates intermittently at a preset period instead of the control to reduce the rotation to a low speed.

  The control device 21 starts the compressor 11 when the power is turned on, starts the C fan 20, and monitors the operation of the C fan 20 (steps S1 and S2). If no abnormality occurs in C fan 20, normal operation is continued (branch to NO in step S3).

  If the C fan 20 abnormally stops, the control device 21 continues the operation by reducing the rotational speed of the compressor 11 to a predetermined value (steps S3 and S4A). The restart of the C fan 20 is repeated up to a preset number N (steps S4B and S5). The number of repetitions N and the repetition time interval are the same as in the first embodiment. If the C fan 20 is actually restarted by the restart control up to N times, it is determined that the C fan 20 is not in failure and returns to normal operation (branch to NO in step S5 and branch to NO in step S3). ).

  However, if the C fan 20 does not actually restart after N restart attempts, the outside air temperature measured by the outside air temperature sensor 22 is more than the predetermined values Tref1 (= 31 ° C.) and Tref 2 (= 33 ° C.). (Step S5 branches to YES and proceeds to step S6). This temperature condition is the same as in the first embodiment.

  In step S6 and subsequent steps, control similar to that in the first embodiment is executed.

  Thereby, there exists an effect | action similar to 1st Embodiment and an effect also with the refrigerator 1 of this 2nd Embodiment. In addition, according to the second embodiment, when an abnormal stop of the C fan 20 is detected, the compressor 11 is temporarily switched to a predetermined low speed operation to continue the refrigeration cycle, and the C fan 20 is restarted. Since the starting is repeated up to N times, it is possible to suppress the rise of the internal temperature during the restarting try period, and there is an advantage that it is possible to avoid the damage of food in the storage as much as possible.

  Even in the second embodiment, the compressor 11 is stopped when the outside air temperature is high by the outside air temperature sensor 22, but the invention is not limited to this, and the C fan 20 is stopped abnormally. If the C fan 20 is not restarted even if it is detected and tried to restart N times, it is possible to employ control for stopping the compressor 11 without considering the outside air temperature.

[Third Embodiment]
The refrigerator of the 3rd Embodiment of this invention is demonstrated using FIG. 4, FIG. The structure of the refrigerator 1 in the present embodiment is the same as that of the first embodiment, and is shown in FIGS. Therefore, in the following description, elements common to the first embodiment will be described using common reference numerals.

  The feature of this embodiment is also the control of the compressor 11 when the C fan 20 is abnormally stopped performed by the control device 21, and the control device 21 tries to restart N times when the C fan 20 stops abnormally. If the C fan 20 does not restart, it is regarded as an abnormal failure, the compressor 11 is stopped according to the outside air temperature, and then the compressor 11 is restarted when the outside air temperature is lowered. Control intermittently in range.

  The functional configuration of the control device 21 is shown in FIG. 4 as in the first embodiment. And the control flow of the control apparatus 21 is what was shown in FIG.

  The control device 21 starts the compressor 11 when the power is turned on, starts the C fan 20, and monitors the operation of the C fan 20 (steps S1 and S2). Thereafter, the processing in steps S1 to S10 is the same as the processing in the first embodiment shown in FIG.

  Even after the abnormal stop of the C fan 20 is confirmed and the compressor 11 is stopped due to the high or low outside air temperature, or the operation is continued and the abnormality of the C fan 20 is displayed on the display 23, the control device 21 does not stop the outside air temperature. Continue monitoring. Then, after the compressor 11 is stopped, if the outside air temperature measured by the outside air temperature sensor 22 is equal to or lower than Tref1, it is determined whether or not a predetermined time has elapsed by looking at the time elapsed since the compressor 11 was stopped ( Steps S21 and S22). Then, if the outside air temperature is equal to or lower than Tref1 and a predetermined time has elapsed since the compressor 11 is stopped, the compressor 11 is restarted (step S23). Also at the time of this restart, since the abnormality of the C fan 20 has not been eliminated, the point of displaying the abnormality of the C fan 20 on the display 23 is continued (step S24).

  The control process after restarting the compressor 11 is the same as the process after step S11 in the first embodiment shown in FIG. 5, and the abnormality notification of the C fan 20 of the display 23 is seen. When the user turns off the power and then turns it on again, if this operation is a normal on / off operation, it is regarded as a user's power-on operation, and the operation of the refrigerator 1 is restarted (branch to NO in steps S11 and S12). ).

  Even if the user restarts the operation of the refrigerator 1 several times to recover the abnormality, if the abnormality of the C fan 20 does not recover, a repair request is made to the manufacturer. Therefore, when a repair engineer is called and the refrigerator 1 is inspected and repaired, it is determined by a special operation of the power switch 24 that has been set in advance that the person is a repairer, and a transition is made to the inspection / repair mode (step). S11, S12, S13).

  Thereby, according to the refrigerator 1 of 3rd Embodiment, there exists an effect | action and effect similar to 1st Embodiment. In addition, according to the third embodiment, even when the C fan 20 is abnormally stopped and the outside air temperature is high, the outside air temperature is lowered to Tref1 after that and the compressor 11 is stopped. If the predetermined time has elapsed since the stop of the compressor 11, the compressor 11 is restarted and the inside of the refrigerator is restarted, so that the outside air temperature is high and the outer shell of the refrigerator 1 becomes excessively hot due to the stop of the compressor 11. It is possible to prevent the food in the warehouse from being damaged as much as possible.

  Even in the present embodiment, the abnormal stop of the C fan 20 is confirmed by N restart attempts, but this is a technique that is adopted as necessary and simplifies the control. Therefore, it is possible to determine that the stop is abnormal by detecting the stop once.

[Fourth Embodiment]
The refrigerator of the 4th Embodiment of this invention is demonstrated using FIG. 4, FIG. The structure of the refrigerator 1 in the present embodiment is the same as that of the first embodiment, and is shown in FIGS. Therefore, in the following description, elements common to the first embodiment will be described using common reference numerals.

  The feature of the present embodiment is also the control of the compressor 11 when the C fan 20 is abnormally stopped performed by the control device 21. The control device 21 rotates the compressor 11 at a low speed when the C fan 20 stops abnormally and freezes it. The cycle operation is continued as much as possible, and if the C fan 20 does not restart after N restart attempts, it is regarded as an abnormal failure, the compressor 11 is stopped according to the outside temperature, and the operation of the refrigeration cycle is performed. Once discontinued, as in the third embodiment, the outside air temperature is monitored, and if the outside air temperature decreases and a predetermined time has passed since the compressor 11 is stopped, the compressor 11 is restarted. And control to resume cooling in the cabinet.

  The functional configuration of the control device 21 is shown in FIG. 4 as in the first embodiment. And the control flow of the control apparatus 21 is what was shown in FIG. In the following, the control of continuing the operation with the compressor 11 rotating at a low speed means that if the compressor 11 is controlled by the inverter, the operation is performed with the frequency lowered to a preset minimum frequency, In the case where the compressor 11 is operated at a constant speed, in the following description, it means that the rotation of the compressor 11 is switched to a control that operates intermittently at a preset period instead of the control to reduce the rotation to a low speed.

  The control device 21 starts the compressor 11 when the power is turned on, starts the C fan 20, and monitors the operation of the C fan 20 (steps S1 and S2). After step S2, the processes of steps S3 to S10 and the processes of steps S11 to S13 are the same as those of the third embodiment shown in FIG. And the process of step S21-S24 after step S8 is common with the process of 3rd Embodiment shown in FIG.

  Thereby, there exists an effect | action similar to 1st Embodiment and an effect also with the refrigerator 1 of this 4th Embodiment. Further, according to the fourth embodiment, as in the second embodiment, when the control device 21 abnormally stops the C fan 20, the compressor 11 is rotated at a low speed and the operation of the refrigeration cycle is continued as much as possible. If the C fan 20 does not restart even after N restart attempts, it is regarded as an abnormal failure, the compressor 11 is stopped according to the outside air temperature, and the operation of the refrigeration cycle is stopped. During this period, it is possible to suppress the rise in the internal temperature, and to avoid the damage of food in the internal storage as much as possible.

  In addition, according to the fourth embodiment, as in the third embodiment, if the outside air temperature is high when the C fan 20 is abnormal, the operation of the compressor 11 is temporarily stopped. The temperature is monitored, and if the outside air temperature is lowered and a predetermined time has elapsed since the compressor 11 is stopped, the compressor 11 is restarted to control the cooling in the warehouse. Similarly to the third embodiment, it is possible to prevent the outer shell of the refrigerator 1 from becoming excessively hot due to the high outside air temperature and the compressor 11 being stopped, and to avoid damaging food in the refrigerator as much as possible. it can.

[Fifth Embodiment]
The refrigerator of the 5th Embodiment of this invention is demonstrated using FIG. 4, FIG. The structure of the refrigerator 1 in the present embodiment is the same as that of the first embodiment, and is shown in FIGS. Therefore, in the following description, elements common to the first embodiment will be described using common reference numerals.

  The feature of this embodiment is also the control of the compressor 11 when the C fan 20 is abnormally stopped performed by the control device 21. The control device 21 tries to restart the compressor 11 N times when the C fan 20 abnormally stops. Even if the C fan 20 does not restart, it is regarded as an abnormal failure, and control is performed to change the rotational speed of the compressor 11 according to the outside air temperature. However, in the case of the present embodiment, in addition to the control of the control device 21 in the second embodiment shown in FIG. 6 for the compressor 11, the two-stage comparison reference value Tref1 (= 31 ° C.) ) / Tref2 (= 33 ° C.) and Tref3 (= 35 ° C.) / Tref4 (= 37 ° C.) are different.

  The functional configuration of the control device 21 is shown in FIG. 4 as in the first embodiment. And the control flow of the control apparatus 21 is what was shown in FIG. In the following, the control of continuing the operation with the compressor 11 rotating at a low speed means that if the compressor 11 is controlled by the inverter, the operation is performed with the frequency lowered to a preset minimum frequency, In the case where the compressor 11 is operated at a constant speed, in the following description, it means that the rotation of the compressor 11 is switched to a control that operates intermittently at a preset period instead of the control to reduce the rotation to a low speed.

  The control device 21 starts the compressor 11 when the power is turned on, starts the C fan 20, and monitors the operation of the C fan 20 (steps S1 and S2). If no abnormality occurs in C fan 20, normal operation is continued (branch to NO in step S3).

  If the C fan 20 abnormally stops, the control device 21 repeats the restart of the C fan 20 up to a preset number N (steps S4 and S5). The number of repetitions N and the repetition time interval are the same as in the first embodiment. If the C fan 20 is actually restarted by the restart control up to N times, it is determined that the C fan 20 is not in failure and returns to normal operation (branch to NO in step S5 and branch to NO in step S3). ).

  However, if the C fan 20 does not actually restart after N restart attempts, the outside air temperature measured by the outside air temperature sensor 22 is the first reference value Tref1 (= 31 ° C.) / Tref2 (= 33). It is determined whether it is higher than (° C.) or not (branch to YES in step S5 and proceed to step S6). This temperature condition is the same as in the first embodiment. If the outside air temperature is lower than the first reference value Tref1 / Tref2, the air cooling of the machine room 10 is stopped by the abnormal stop of the C fan 20, and the machine room 10 is not operated even if the compressor 11 is continuously operated. Is not excessively high, and the outer shell temperature of the refrigerator 1 is not excessively high. Therefore, the normal operation of the compressor 11 is continued, and an abnormal stop of the C fan 20 is displayed on the display 23. The user is notified (branch to NO in step S6, steps S9 and S10).

  In step S6, if the outside air temperature is higher than the first reference value Tref1 (= 31 ° C.) / Tref2 (= 33 ° C.), if the normal operation of the compressor 11 is continued, the inside of the machine room 10 is likely to become hot. Therefore, control of step S7A-S7C is performed. That is, even when the C fan 20 is abnormally stopped, if the outside air temperature is lower than the second reference value Tref3 / Tref4, the inside of the machine room 10 becomes high temperature, and the outer shell temperature of the refrigerator 1 becomes excessively high. Therefore, the normal operation speed R1 of the compressor 11 is maintained as before (steps S7A and S7B). In this case, when the C fan 20 is stopped, it is necessary to rotate the compressor 11 at a high speed R2 (> R1) in order to prevent a temperature rise, but the rotation speed of R1 is maintained. Try to avoid damaging food in the cabinet as much as possible.

  On the other hand, if the outside air temperature is higher than the second reference value Tref3 / Tref4 in a state where the C fan 20 is abnormally stopped, the inside of the machine room 10 becomes high temperature, and the outer shell temperature of the refrigerator 1 becomes excessively high. Therefore, the compressor 11 is continuously operated in order to avoid as much as possible the damage to the food in the refrigerator, but the rotation speed is reduced to the low speed R3 (<R1) (steps S7A and S7C). In any of these cases, the abnormal stop of the C fan 20 is displayed on the display 23 (step S8).

  Thereafter, the processing after step S11 is the same as that of the first embodiment, and the abnormality of the C fan 20 must be recovered even if the user restarts the operation of the refrigerator 1 several times for the recovery of the abnormality. If this is the case, a repair request will be sent to the manufacturer. Therefore, when a repair engineer is called and the refrigerator 1 is inspected and repaired, it is determined by a special operation of the power switch 24 that has been set in advance that the person is a repairer, and a transition is made to the inspection / repair mode (step). S11, S12, S13).

  Thereby, the refrigerator 1 according to the fifth embodiment also provides the same operations and effects as those of the first embodiment. In addition, according to the fifth embodiment, the reference of the outside air temperature is divided into two stages, and the compressor 11 is continuously operated at a certain speed in a high temperature environment where the outside air temperature exceeds 35 ° C. If the temperature rises and the outside air temperature becomes higher, the compressor 11 continues to operate at the minimum capacity of the refrigeration cycle by further reducing the rotation speed of the compressor 11, and thus the outer shell of the refrigerator becomes excessive. It is possible to prevent the temperature of the food from rising and to avoid damage to food in the cabinet as much as possible.

[Sixth Embodiment]
The refrigerator of the 6th Embodiment of this invention is demonstrated using FIG. 10, FIG. The structure of the refrigerator 1 in the present embodiment is the same as that of the first embodiment, and is shown in FIGS. Therefore, in the following description, elements common to the first embodiment will be described using common reference numerals.

  The present embodiment is characterized in that a machine room temperature sensor 26 for measuring the room temperature is installed in the machine room 10 as shown in FIG. 11 is performed with reference to the measured degree of the machine room temperature sensor 26 together with the measured degree of the outside air temperature sensor 22. That is, if the C fan 20 does not restart when the C fan 20 is abnormally stopped when the C fan 20 is abnormally stopped, it is regarded as an abnormal failure, and the outside air temperature is high and the machine room temperature is high. If the temperature is too high, the rotation speed of the compressor 11 is switched to a low speed or controlled to stop. The machine room sensor 26 is preferably installed in the vicinity of the compressor 11 and the heat radiating pipe 25 which are heat generating components in the machine room.

  The functional configuration of the control device 21 is as shown in FIG. And the control flow of the control apparatus 21 is what was shown in FIG. The control device 21 starts the compressor 11 when the power is turned on, starts the C fan 20, and monitors the operation of the C fan 20 (steps S1 and S2). If no abnormality occurs in C fan 20, normal operation is continued (branch to NO in step S3).

  If the C fan 20 abnormally stops, the control device 21 repeats the restart of the C fan 20 up to a preset number N (steps S4 and S5). The number of repetitions N and the repetition time interval are the same as in the first embodiment. If the C fan 20 is actually restarted by the restart control up to N times, it is determined that the C fan 20 is not in failure and returns to normal operation (branch to NO in step S5 and branch to NO in step S3). ).

  However, if the C fan 20 does not actually restart after N restart attempts, the outside air temperature measured by the outside air temperature sensor 22 is more than the predetermined value Tref1 (= 31 ° C.) / Tref2 (= 33 ° C.). (Step S5 branches to YES and proceeds to step S6). This temperature condition is the same as in the first embodiment. If the outside air temperature is lower than the predetermined value Tref1 / Tref2, the air cooling of the machine room 10 is stopped by the abnormal stop of the C fan 20, and the machine room 10 is excessively excessive even if the compressor 11 is continuously operated. Since the temperature does not become high and the outer shell temperature of the refrigerator 1 does not become excessively high, the normal operation of the compressor 11 is continued, and the abnormal stop of the C fan 20 is displayed on the display 23 for use. (NO in step S6, steps S9 and S10).

  In step S6, if the outside air temperature is higher than the predetermined value Tref1 / Tref2, the machine room temperature is further referred to. If the machine room temperature is excessively high, the compressor 11 is stopped to stop the machine room 10. The inside of the refrigerator 1 is prevented from becoming too hot and the outer shell temperature of the refrigerator 1 is prevented from becoming excessively high (steps S6, S31, S32). Then, the abnormal stop of the C fan 20 is displayed on the display unit 23 to notify the user (step S8).

  Thereafter, the processing after step S11 is the same as that of the first embodiment, and the abnormality of the C fan 20 must be recovered even if the user restarts the operation of the refrigerator 1 several times for the recovery of the abnormality. If this is the case, a repair request will be sent to the manufacturer. Therefore, when a repair engineer is called and the refrigerator 1 is inspected and repaired, it is determined by a special operation of the power switch 24 that has been set in advance that the person is a repairer, and a transition is made to the inspection / repair mode (step). S11, S12, S13).

  As a result, the refrigerator 1 according to the sixth embodiment also exhibits the same operations and effects as those of the first embodiment. In addition, according to the sixth embodiment, the machine room temperature sensor 26 for measuring the room temperature is installed in the machine room 10, and the compressor 11 is operated by the controller 21 when the C fan 20 is abnormally stopped. The control is performed with reference to the measurement degree of the machine room temperature sensor 26 together with the measurement degree of the outside air temperature sensor 22, and the rotation speed of the compressor 11 is stopped when the outside air temperature is high and the machine room temperature is also high. By performing the control, it is possible to stop the compressor 11 only when the temperature of the outer shell of the refrigerator surely rises excessively and to prevent such an excessively high temperature.

  In addition, although the case where the control which stops the compressor 11 was demonstrated above was replaced with this, it can also be made to perform control which makes the compressor 11 rotate at low speed and continues an operation | movement. In this case, if the compressor 11 is controlled by an inverter, the operation is performed at a low speed by operating with the frequency lowered to a preset minimum frequency. On the other hand, when the compressor 11 is operated at a constant speed, in the following description, control for intermittently operating the rotation of the compressor 11 at a preset period is performed instead of the control for dropping to low speed rotation.

Sectional drawing of the refrigerator of the 1st Embodiment of this invention. The refrigeration cycle figure of the refrigerator of the said embodiment. The perspective view of the machine room interior of the refrigerator of the said embodiment. The block diagram of the control apparatus in the refrigerator of the said embodiment. The flowchart of the control operation of the control apparatus in the refrigerator of the said embodiment. The flowchart of the control action of the control apparatus in the refrigerator of 2nd Embodiment of this invention. The flowchart of the control action of the control apparatus in the refrigerator of the 3rd Embodiment of this invention. The flowchart of the control action of the control apparatus in the refrigerator of the 4th Embodiment of this invention. The flowchart of the control action of the control apparatus in the refrigerator of the 5th Embodiment of this invention. The block diagram of the control apparatus in the refrigerator of the 6th Embodiment of this invention. The flowchart of the control operation of the control apparatus in the refrigerator of the said embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Refrigerator 2 Refrigerator main body 4 Refrigeration room 6 Freezing room 7 Refrigeration evaporator (R EVA)
8 Cooling fan (R fan) for refrigeration
10 Machine room 11 Compressor 12 Condenser 13 Refrigeration cooling fan (F fan)
14 Refrigerating evaporator (F EVA)
15 Three-way valve 20 Machine room fan (C fan)
21 Control Device 22 Outside Air Temperature Sensor 23 Display 24 Power Switch 26 Machine Room Temperature Sensor

Claims (13)

In the refrigerator provided with a compressor in the machine room and installed with a machine room fan to cool the machine in the machine room,
An outside air temperature sensor for measuring outside air temperature around the refrigerator;
Fan abnormality monitoring means for detecting an abnormal stop of the machine room fan;
Compressor control for controlling to stop the compressor when the fan abnormality monitoring means detects an abnormal stop of the machine room fan and the outside air temperature measured by the outside air temperature sensor is higher than a predetermined value. Means,
A refrigerator having fan abnormality display means for displaying an abnormality of a machine room fan when the compressor is stopped by the compressor control means. A machine room temperature sensor for measuring the temperature of the machine room;
The compressor control means detects the abnormal stop of the machine room fan by the fan abnormality monitoring means, the outside air temperature measured by the outside air temperature sensor is higher than a predetermined value, and the machine room temperature sensor The refrigerator according to claim 1, wherein the compressor is controlled to stop when the measured machine room temperature is higher than a predetermined value.   The compressor control means refers to the outside air temperature measured by the outside air temperature sensor when a predetermined time elapses after the compressor is stopped, and restarts the compressor if the air temperature is lower than the predetermined value. The refrigerator according to claim 1, wherein the refrigerator is controlled. In the refrigerator equipped with an inverter-controlled compressor in the machine room and installed with a machine room fan for air-cooling the machine in the machine room,
An outside air temperature sensor for measuring outside air temperature around the refrigerator;
Fan abnormality monitoring means for detecting an abnormal stop of the machine room fan;
When the fan abnormality monitoring means detects an abnormal stop of the machine room fan and the outside air temperature measured by the outside air temperature sensor is higher than a predetermined value, the compressor is made slower than the normal operation speed. Compressor control means for controlling the vehicle to decelerate,
A refrigerator having fan abnormality display means for displaying an abnormality of a machine room fan when the compressor is decelerated by the compressor control means.   5. The refrigerator according to claim 4, wherein the compressor control unit changes a deceleration with respect to a normal operation speed of the compressor according to an outside air temperature measured by the outside air temperature sensor. A machine room temperature sensor for measuring the temperature of the machine room;
The compressor control means detects the abnormal stop of the machine room fan by the fan abnormality monitoring means, the outside air temperature measured by the outside air temperature sensor is higher than a predetermined value, and the machine room temperature sensor The refrigerator according to claim 4, wherein when the measured machine room temperature is higher than a predetermined value, the compressor is controlled to be decelerated at a speed lower than a normal operation speed.   The compressor control means refers to the outside air temperature measured by the outside air temperature sensor when a predetermined time elapses after the compressor is switched to the deceleration operation, and if the air temperature is lower than the predetermined value, the compressor is controlled. 5. The refrigerator according to claim 4, wherein control is performed to return to a normal operation speed. In the refrigerator equipped with a compressor operating at a constant speed in the machine room, and installed with a machine room fan to cool the machine in the machine room,
An outside air temperature sensor for measuring outside air temperature around the refrigerator;
Fan abnormality monitoring means for detecting an abnormal stop of the machine room fan;
When the fan abnormality monitoring means detects an abnormal stop of the machine room fan and the outside air temperature measured by the outside air temperature sensor is higher than a predetermined value, the compressor is operated for a time shorter than a normal operation time. Compressor control means for controlling so as to perform intermittent operation;
A refrigerator comprising fan abnormality display means for displaying an abnormality of a machine room fan when the compressor is intermittently operated by the compressor control means.   The refrigerator according to claim 8, wherein the compressor control means changes a rate of shortening the operation time of the compressor according to an outside air temperature measured by the outside air temperature sensor. A machine room temperature sensor for measuring the temperature of the machine room;
9. The refrigerator according to claim 8, wherein the compressor control means performs control to intermittently operate the compressor when the machine room temperature measured by the machine room temperature sensor is higher than a predetermined value.   The compressor control means refers to the outside air temperature measured by the outside air temperature sensor when a predetermined time elapses after the compressor is switched to intermittent operation, and if the air temperature is lower than the predetermined value, the compressor is controlled. The refrigerator according to claim 8, wherein control is performed to return to normal continuous operation.   The fan abnormality monitoring means restarts up to a predetermined number of times when the machine room fan stops, determines that the machine room fan has stopped abnormally when the machine room fan does not restart even after the predetermined number of restarts, The refrigerator according to any one of claims 1, 4 and 8, wherein the compressor control means is notified.   The compressor control means, when the fan abnormality monitoring means detects the first abnormal stop of the machine room fan, continues to operate the compressor in an intermittent operation shorter than a normal operation time, 9. The control according to claim 1, wherein the fan abnormality monitoring means controls to stop the operation of the compressor when the machine room fan continuously detects an abnormal stop of the machine room a predetermined number of times. refrigerator.

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